*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: white;
}

#app {
  width: 100vw;
  height: 100vh;
  margin: 0;
  padding: 0;
  text-align: center;
  overflow-y: scroll; /* 或 overflow-x: scroll; */
  -ms-overflow-style: none;  /* IE 和 Edge */
  scrollbar-width: none;  /* Firefox */
}

